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MySQL - AUTO INCREMENT

Posted on 2002-05-01
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Last Modified: 2010-04-04
After I insert a row by SQL statement, a auto increment value will be assigned. How can I retrive this auto increment value ?

Andrew
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Question by:andrewyu
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10 Comments
 
LVL 17

Expert Comment

by:inthe
ID: 6985285
hi,
 you may be able to use mysql_insert_id :
http://www.mysql.com/doc/m/y/mysql_insert_id.html

also maybe of interest:
http://www.mysql.com/doc/e/x/example-AUTO_INCREMENT.html

else i guess a stored procedure ,i dunno about using them but someone (like meikl :) be along soon enough..
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LVL 17

Expert Comment

by:inthe
ID: 6985302
sorry i was thinking php ,i meant use a select statement with LAST_INSERT_ID()instead.

http://www.mysql.com/doc/O/D/ODBC_and_last_insert_id.html
http://www.mysql.com/doc/G/e/Getting_unique_ID.html
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Author Comment

by:andrewyu
ID: 6985308
I tried LAST_INSERT_ID, but, raise a DBException.

Andrew
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LVL 17

Expert Comment

by:inthe
ID: 6985317
how are you connecting to mysql
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LVL 17

Expert Comment

by:inthe
ID: 6985421
hi,
i tested an example ,it works fine here :

procedure TForm1.Table1AfterPost(DataSet: TDataSet);
var
 i:  integer;
begin
 Query1.sql.add('insert into testtable(name)');
 Query1.sql.add(' values(''barry'')');
 Query1.execSql;
 Query1.close;
 Query1.sql.clear;
 Query1.sql.add('SELECT LAST_INSERT_ID()');
 Query1.open;
 Query1.first;
 i := Query1.fields[0].asInteger;
 form1.caption := inttostr(i);
end;
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LVL 17

Expert Comment

by:inthe
ID: 6985425
ps,
you can delete the first three lines
(i tested on a button first :)
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Author Comment

by:andrewyu
ID: 6985968
I had already tried it and it raised a exception.

I use dbExpress to establish connection with mysqld-max-nt.

Andrew
PS:they are running on same Windows XP Professional machine
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LVL 17

Expert Comment

by:inthe
ID: 6988070
hi andrew,
sorry i dont have dbExpress to try it out.
someone else may have idea ,i guess not many people here are using mysql,normally db questions have lots of commenters..
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by:pnh73
ID: 9004484
No comment has been added lately, so it's time to clean up this TA.
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Paul (pnh73)
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